Microscopes and Cells Flashcards
what are microscopes used for
used to see very small things bigger and in more detail
what are the different types of microscopes
light and electron microscopes
how does a light microscope work
a light microscope uses light to light up the object that you are wanting to see it through the objective and ocular lens
how does an electron microscope work
an electron microscope uses a beam of electrons that repel of the object and depending on how long it takes for the electrons to hit back depends on the darkness of the colour.
why does an electron microscope have better resolution than a light microscope
because light travels doesn’t always bounce of the particles they mainly pass around them. so by using electrons which are smaller than more of the electrons bounce of the particles which is why pictures are more detailed than from light microscopes
how do you calculate image size
actual size x magnification
how do you calculate actual size
image size / magnification
how do you calculate magnification
image size / actual size
what are the two different types of cells
Prokaryotic and Eukaryotic cells
what is cell theory
the idea that all organisms are made up of cells that derive (come from) from other cells
what can cells not do
spontaneously form. cells create other cells
what are ultra structures
small scale arrangement of the cells that are only able be seen under a electron microscope.
what are organelles
they are specialised structures in cells which carry out specific functions.
what organelles do eukaryotic cells contain
membrane-bound organelles
what do prokaryotic cells not contain
nucleus or membrane-bound organelles
